Tube thread grinding machine



NOV- 27, 1951 Cy A. REIMSCHISSEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 13 Sheets-Sheet l N It TB 5 76a T.. 352 g if f M212 359 P48 '88" \'""'N64'1 l L. J

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TUBE THREAD GRINDING MACHINE Filed May 29, 1947 15 Sheets-Sheet 2CHARLESY A. REIMSCHISSEL GEORGE E. HIEBER mwkww www NOV- 27, 1951 c. A.RElMscl-HSSEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947' 13 Sheets-Sheet 5CHARLES A. FeEmscHllssEl.

IE] GEORGE E. HIEBER NOV. 27, 1951 c. A. RElMscHlssEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 13 Sheets-Sheet 4CHARLES A. REIMSCHISSEL Fig. E] GEORGE E. HIEBER 5M QRMN E www www@ Nov.27, 1951 c. A. RElMscHlsSEL ET Al. 2,576,239

TUBE THREAD GRINDINGv MACHINE Filed May 29, 1947 l5 Sheets-Sheel 5 NOV27, 1951 c. A. REIMSCHISSEL ET A1. 2,576,239

TUBE THREAD GRINDING MACHINE Filedjmay 29, 1947 15 sheets-sheet e /O-loa 344-` 356 338 4oz 34W \\\33o 1 336 (326 a32a 378 404 Q 382 10o 26437e seo 400 ook 28o 96 27g ggf? 38e 97 302 3l31o306 9o 4a mf 2 w Z .Fig5 Sme/whom.

CHARLES' A. REIMSCHISSEL GEORGE E. HIEBER mmxwww @www NOV- 27, 1951 c.A. RElMscHlssEl. ET AL 2,576,239

TUBE THREAD GRINDING MACHINE 13 Sheets-Sheet 7 Filed May 29, 1947 uws /ACHARLES A. RElMscs-HssEL -GEORGE E. H l EEIER NOV 27, 1951 c. A.REIMscl-nssr-:L ET AL 2,576,239

TUBE THREAD GEINDING MACHINE me/vm l CHARLES A. REIMSCHISSEL.

H GEORGE E. HEBER @M MMBWM @www NOV- 27, 1951 c. A. Rr-:lMscHlssEL ETAl.

TUBE THREAD GRINDING MACHINE 15 Sheets-Sheet 9 Filed May 29, 1947 LR...v E SB IE WH me. E E G RR A m SG. E L R A H C Nov. 27, 1951 c. A,RElMscHIssEL ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 l5 Sheets-Sheet lO iB O47a LL 594 g 59.2 51g. ZE I 46e I H536@ mm1-Vw l Y wh; 55 )l sus i 2 vL] x b i 58 ,mm 458 i E56 517 y.-

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gmc/whom GEORGE E. WEBER 5M Nov. 27, 1951 c. A, RElMscl-HSSEL ET AL2,576,239

TUBE THREAD GRINDING MACHINE 13 Shees-Sheef. ll

Filed May 29, 1947 Y ljlll Il" .Ei

www@ vv@ CHARLES A. RElMscl-nssEL GEORGEE. Hn-:BER

Nov. 27, 1951 c. A. RElMscHxssEL. ETAL 2,575,239

TUBE THREAD GRINDIG MACHINE Filed May 29, 1947 l5 Sheets-Sheet l2 O wooCHARLES A. REIMSCHISSEL ISS] GEORGE E. HIEBER N 9 2M Swamp NOV- 27, 1951c. A. RElMscHlssEL. ET AL 2,576,239

TUBE THREAD GRINDING MACHINE Filed May 29, 1947 13 SheeLS-Shet 13CHARLES A. RElMSCHISSEl.

GEORGE E. HIEBER Ff g'. 125A Patented Nov. 27, 1951 TUBE THREAD GRINDINGMACHINE Charles A. Reimschissel and George E. Hieber, Waynesboro, Pa.,assignors to Landis Machine Company, Waynesboro, Pa., a corporation ofPennsylvania Application May 29, 1947, Serial No. '151,402`

23 Claims.

This invention relates to machines for abrading metal and, moreparticularly, to amachine for I automatically successively grindingcontours, in-

cluding threads, upon the exterior surfaces of pipe, tubing, and thelike.

The present invention embraces numerous advances over the prior art. Thesteady trend, especially in the petroleum industry, to the use of pipehaving greater strength andconsequently less advantageous machiningcharacteristics, reduces the effectiveness of the present method offorming the threads, etc., by cutting away the metal by the use of highspeed tool steel cutters. The high-tensile alloy steels now used in themanufacture of much of the pipe used by the petroleum industry requiresuch a low cutting speed as to render that method of machiningrelatively uneconomical.

'I'he provision, in the present invention, for automatic and sequentialgrinding of the desired and efcient wheel dressing mechanisms of theproper type for both the grinding wheels.

taper and thread on the pipe enables the production of pipe ends ofimproved accuracy and finish at a much faster rate than is possible whenusing a metal cutting operation.

Accordingly, it is an object 'of the invention to' provide a'machine forgrinding first a tapered end and then a length of thread upon a pipe.without transferring the pipe between operations.

In the broader sense, itis possible, as will later be shown in detail,tot, perform two4 successive forming operations of various character.Such unusual operations are' occasionally necessary as in the case of atubing joint requiring two lengths of threads on the same end of thetube and having a sealing surface therebetween.

It is a further objectI of the invention to provide, 1n one machine,separate grinding mechanisms for performing preliminary and finishingoperations upon a work piece, so that the preliminary operation, forinstance taper forming, is performed by one grinding wheel, and thethreading operation is performed by another.`

Another object of the invention is the provision of ingenious mechanismto compensate for the change in grinding wheel diameter due to thedressing operation, so that the working position of the wheel peripheryis not affected by such change.

A further object is to provide novel means for combining the adjustmentof both grinding wheels relative to the work, so that a change in theworking position of the grinding wheels, necessitated by a change in thework diameter, may be quickly and accurately made.

Another object is the provision of convenient Another object is theprovision of a novel machine for automatically performing sequentialgrinding operations upon a workpiece whichhas been inserted into themachine.

Still other objects are to provide for the adjustment of the machine forvarious work diameters, tapers, thread lengths and helix angles, as wellas to provide' a machine which may be operated entirely automatically,once said adjustments are made.

Various other objects and advantages will be apparent from reference tothe following description of a preferred embodiment of the invention andthe accompanying drawings thereof.

In the drawings:

Figures 1 and 1A comprise .a plan View of the entire` machine;

Figure 1B is a partial plan view of that portion of the machine adjacentits centerline;

Figure 2 is a side elevation of the thread grinding wheel head;

Figure 3 is an elevation of the thread grinding wheel head takensubstantially along line 3`3 of Figure 1;

` Figure 4 is a longitudinal sectional view of the thread grinding wheelhead taken substantially along line 4-4 of Figure 3;

Figure 5-is a transverse sectional View of the thread grinding wheelhead taken substantially along line 5-'5 of Figure 4;

Figure 6 is ,a fragmentary vertical sectional view on line 6--6 ofFigure 4;

Figure 7 is a fragmentary vertical section on line 'l-l of Figure 4;

y Figure 8 is a fragmentary vertical section on line 8-8 of Figure 1;

Figure 9 is a fragmentary vertical `section on line 9--9 of Figure 1; A

Figure 10 is a side elevation ing wheel head; g .i

Figure 11 is a longitudinal sectional view` taper grinding wheel headtakenalong line II-Il ofFigure l2; l A

Figure 12 is a transverse sectional view of the taper grinding wheelhead taken substantially along line l2-I2 of Figure 11; Y f

Figure 13 is a fragmentary horizontal section jhe Substantially on lineI3|3 of Figure 2; and also shows the cover removed and being partiallyin section on Figure 15 is a vertical sectional view of the stock stopand leadscrew housing on line |5|8 of Figure 14;

Figure 16 is a vertical sectional view of the leadscrew mechanism online |8|8 of Figure 14, detail beyond the plane ofthe section beingomitted for purposes of clarity; y

Figure 1'7 is a vertical sectional view of the leadscrew mechanism online |1| 1 of Figure 14, detail beyond the plane of section beingomitted for purposes of clarity; and

Figures 18 and 18A taken together are a diagram of the electric circuitand hydraulic sys-` tem which are interconnected to automaticallyoperate the machine.

As seen in Figures 1 and 1A, the main divisions of the machine are theheadstock 3 8, the taper grinding mechanism 32, the thread grindingmechanism 34 and the housing 36 containing the leadscrew and mechanismfor regulating the axial position of ythe pipe to be machined. It willbe noted that the taper grinding mechanism 32, the thread grindingmechanism 34 and the stock stop and leadscrew housing 38 are mountedupon a stationary base 31 which is secured at 38 to the headstock 38.vThe base 31 may be an integral structure or, for convenience ofmanufacture, it may be subdivided into a.

number of sections, secured together by bolts orl the like.

The headstock 38 may be of a type now known to those skilled in the arthaving front and rear chucks 38 and 48 respectively for gripping thepipe. Chucks 38 and 48 are mounted upon opposite ends of a rotatablespindle 35 (Figure 18) which is driven through a worm 4| and a wormwheel 43 by a reversible direct current motor 42. Chucks 38 and 43 areopened and closed by yokes 44 and 4'8 respectively which are operated bya iiuid cylinder 41 (Figure 18) contained in the headstock 38.

The above-described mechanism thus serves to support and rotate the pipe(indicated at 45) accurately about a constant axis and at a desiredspeed so that metal removing operations may be performed upon it. Thedetailed construction of said mechanism forms no part of Referring toFigures 2, 3 and 4, the base 31 directly supports the slide base 48. Apivot'pln 58 (Figure 4) is journalled through suitable aligned openingsin both base 31 and slide base 48. Thus slide base 48 may be swivelledon base 31 about the axis lof pivot pin 58. As seen in Figure 13, abracket 52 is secured to base 31 by screws 54, near the rearward end ofsaid base 31 and laterally spaced from slide base 48.

A pin -56 is passed vertically through the two rearwardly extending arms58, 88 (Figure 2) of thebracket 52. Pin 56 is provided with a transverseopening 62 between arms 58 and 88, through which the screw 84 isjournalled for rotation. Axial movement of screw 84 in one direction isprevented by the shoulder 86 thereon which abuts the iiattened side ofpin 58. The

:opposite side of pin 56 is also attened adjacent -lopening 82 toreceive in abutting relation the hub ofrhandwheel 88 which is securedagainst vrotation on screw '84l by a suitable key, not shown, andagainst axial movement by the nut 18 (Figure 2) threaded upon the outerextremity of screw 84.

The slide base 48 is provided with a vertically spaced pair of lugs 12(Figures -1 and 13) throughv which the pin 14 is journalled. The screw64 is threadedly engaged in a transverse threaded hole 15 in pin 14between the-lugs 12. The abovedescribed mechanism constitutes the meansfor rotating the slide base 48 about the pivot pin 58. The requireddegree of rotation is achieved by reading the cooperating pointer 18(Figure 13), attached to the rearward wall of slide base 48, and scale.18 inscribed upon the adjacent top surface of base 31. A screw 88(Figure 13) having threaded engagement with a suitable opening in base31 passes through-elongated slot 82 in lug 84, which is formedintegrally with slide base 48, and when tightened, secures slide base 48in adjusted angular position.

As will be more fully realized later, this swivelling motion of slidebase 48 in a horizontal plane about pivot pin 58 is for the purpose ofexactly aligning said base and all the mechanism carried thereby,including the grinding wheel, with the taper vof the thread desired tobe produced upon the pipe, as seen in Figure 1.

As seen in Figure 4, the slide base 48 is provided with a pair oftransverse slideways 88 and 88 upon which is mounted the cross slide 88.Slideway 88 is V-shaped and provided with rollers 82. Slideway 88 is ofthe fiat type and is provided with rollers 84. Rollers 82 and 84 serveto eliminate friction and insure the facile movement of cross slide 88in a transverse direction, movement in the longitudinal direction beingprevented by the V-shaped Slideway 88.

Referring to, Figure 5, cross slide 88 is provided on its top surfacewith the flat slideways 98 and 81 and the V-shaped slideway 98 arrangedin the longitudinal direction. Upon these ways, the wheel slide |88 ismounted. A bracket |82 (Figures 2 and 4) is mounted upon the rear wallof wheel slide |88 and extends rearwardly therefrom to engage the pistonrod |84 oi' an hydraulic cylinder |88 which is secured to the rear wallof the cross slide 88. Cylinder |86 is operable automatically toreciprocate the wheel slide |88 in a direction perpendicular to thedirection of movement of the cross slide 98. The manner in which suchauwmatic operation may he accomplished will be described later.

The wheel slide 88 has along one side thereof y the integral upwardextension |88 (Figures 1, 2

and 4). To the centrallyfacing wall |88 (Figure 4) of extension |88 issecured, in a manner to be described later, the spindle housing ||8,(Figure 6). A cylindrical opening ||2 (Figure 6) through housing |18contains-at opposite ends thereof, the bearings ||4 and I8, axiallyspacedapart by means oi the spacing sleeve I8. The wheel spindle |28 isthus rotatably supported by bearings ||4 and H8.

At one end of the opening I2, bearings-I |8 are which is retained inposition axially by the cap At the opposite end of opening H2, thebearings ||4 are retained therein by the stationary cap |40, which abutsthe outer bearing race and is secured to spindle housing ||0 by means ofscrews |42, and by a shoulder |44 which is formed integrally withspindle |20 and which abuts the inner race. A rotating cap |46 issecured by means of screws |48 or the like-to shoulder |44 and providesan end seal by having, together with cap |40, interiitting ridges andgrooves |50. The tapered end |52 of spindle |20 supports the ilangedgrinding wheel hub |54 which is retained thereon by means of the cap |56and screws |58. A key |60 prevents independent rotation of hub |54 andspindle |20. The thread grinding wheel |62 is axially retained on hub|54 |by the integral flange |64 on one side and the plate |66 on theother side. Screws |68 secure plate |66 to hub |54 and clamp the wheel|62 against ilange |64.

Wheel slide |00 is formed with an integral upward extension (Figure 2)along its rearward end. Extension |10 is provided with a plane rear face|1| to which is secured by screws |12 the swivel plate |14. Lugs |16(Figure 1) at each end of the top of plate |14 support the rod |18 whichis also journalled through the lugs |80 which are formed integrally withthe motor plate |82. A motor |84 is attached to motor plate |82 as bymeans of bolts |86. A set screw |88 is threaded into the bottom of themotor plate |82, passing therethrough to engage the rear surface |81 ofswivel plate |14. A nut |90 retains screw |68 in adjusted axialposition. Thus, by rotating motor |84 slightly about rod |18, by meansof screw |88, the distance between the motor axis and the grinding wheelaxis may be varied, providing a means for adjusting the tension of thedriving belts |92 which connect the wheel sheave |32 and the motorsheave |93 which is mounted on the motor shaft.

The mounting 'of the swivel plate |14 and the spindle housing I0 atopposite ends of the wheel slide |00 is shown in Figure 4 and Figures 6to 9 inclusive. The spindle housing ||0 is secured to the forwardvertical wall |09 of extension |08 by means of four screws |94 each ofwhich threadedly engages a block |96 of T-shaped cross-section. TheT-slots |98 formed in the face |09 of extension |08 prevent the blocks|96 from moving axially and thus the spindle housing ||0 is firmlysecured to extension |08. Bosses |95 on housing ||0 have horizontallyelongated openings |91 therethrough, for the passage of the screws |94.Thus when screws |94 are loosened, spindle housing I0 may be rotated ina vertical plane, as will be described.

`A pair of pins 200 (Figures 4, 6 and 7) are embedded in extension |08and protrude therefrom to thereby fasten the arcuately formed shoes 202to the face |09. The shoes 202 are received in a shallow arcuate groove204 lying in a vertical plane and formed in the rearward surface ofhousing -I I0. The center from which groove 204 is formed lies in ahorizontal plane containing the grinding wheel axis and in a transversevertical plane bisecting the grinding wheel |62. It is evident thereforethat the screws |94 may be loosened and the spindle housing ||0 and allmechanism supported thereby may be rotated in a vertical plane about ahorizontal line bisecting the grinding wheel and passing through itsaxis.

The above described adjustment is for the purpose of tilting thegrinding wheel |62 into alignment with the predetermined helix angle ofthe thread to be produced and is similar to the adjustment therefordisclosed in the izo-pending application of Mr. Clarence B. Ziegler,Serial No. 519,210, i'lled January 21, 1944, now Patent No. 2,557,166,dated January 19, 1951.

To drive the grinding wheel spindle |20 without twisting the belts |92as the housing- ||0 is rotated, a similar adjustment is provided for themotor |84. The screws |12 which secure swivel plate |14 to extension |10pass through elongated slots 206 (Figure 8) therein, which permitrotation ,of plate |14 in a vertical plane. A pivot member 208 formedcylindrically with two diameters 201 and 209 has its larger diameterportion 209 extending into plate |14 and is secured thereto by screws2|0. The smaller diameter portion 201 of pivot member 208 is free torotate in a suitable mating opening inv` extension |10 as shown inFigure 8. The center of pivot member 208 lies in the horizontal lineabout which housing ||0 is rotatable. Thus, when screws |12 areloosened, swivel plate |14 and all parts attached thereto may be rotatedto the desired angle, keeping the two belt sheaves |32 and |93 inaccurate alignment.

The mechanism for rotating the swivel plate |14 and spindle housing ||0in unison is best shown in Figure 9. The handwheel 2|2 is secured to thetop of the vertical shaft 2| 4, which is journalled through the cover2|6 of the gear box 2|8 which is mounted on wheel slide |00 at thejuncture of extensions |08 and |10 (Figures 1 and 2). Shaft 2|4 extendsdownwardly through the interior of extension |10 and has its lower endjournalled through the lower arm of a U-shaped bracket 220 formedintegrally with the rear wall of extension |10. A recess 222 is formedin the rear wall of extension |10 by the U-shape of the integral bracket220. That portion of shaft 2|4 which passes through the recess 222 isthreaded to engage thereon the travelling nut 224. Nut 224 is providedwith a cylindrical projection 226 which extends outwardly from thesurface of extension |10 to be pivotally received in a-mating opening inthe rectangular sliding block 228, which is free to move laterally in aslot 230 in the forward surface of plate |14. Thus, after screws |12 areloosened, the vertical movement of nut 224, caused by manual rotation ofhandwheel 2| 2, will cause plate |14 and themotor attached thereto torotate about the pivot mem- `ber 208.

The gear box 2|8 contains the bevel gear 232, ilxed to the shaft 2|4 forrotation therewith. A mating bevel gear 234 is-similarly iixed to shaft236 which is iournalled through the side of gear box 2|8 and whichextends through the side of a similar gear box 238 at the forward end ofextension |08. Within gear box 238, the bevel gear 240 is xed on shaft236 to mate withbevel gear 242 which isvxed tothe vertical shaft244.Shaft 244 is journalled in the cover 246 of gear box 238 and inthe lowerarm 249 of a U-shaped bracket 248 formed integrally with the forwardwall of extension |08.

A recess 250 in the forward wall |09 of extension |08 is formed andenclosed by the integral bracket 248. That portion of shaft 244 whichpasses through the recess 250 is threaded to engage thereon thetravelling nut 252. Nut 252 is provided with a cylindrical projection254 which extends outwardly from the surface of wall |09 to be pivotallyreceived in a mating opening in the rectangular sliding block 256, whichis free to move laterally in a slot 258 in the rearward Y surface ofspindle housing I I0. Thus when screws audace 7 |84 are loosened thevertical movement of nut 252, caused by manual rotation of handwheel2|2, will raise or lower the sliding block 256 and cause housing I l andthe parts supported thereby to rotate about the center of groove 204. It

Awill be seen, therefore, that the angular adjustment of grinding wheel|62 and wheel motor |84 .260, the shaft 264 extends rearwardly therefromand is provided at its rearward extremity with a guide portion 266 whichis journalled for rotation in a suitable opening 268 in the lug 210formed integrally with wheel slide |00. On shaft 264 and between guideportion 266 and lug 260 are formed two threaded portions 212 and 214having threads of opposite hand.

Threadedly engaged on the rearward threaded portion 212 of shaft 264 isthe bracket 216. As best seen in Figure 5, two vertically disposed webs218, 280 are formed integral with wheel slide |00 and are arranged oneon each sidef the travelling bracket 216. Rectangular slideways 282 and284 formed in the oppositely disposed surfaces of webs 218 and 280respectively serve .to support bracket 216; Across the'lower portion ofits forward surface, bracket 216 is provided with the hardened plate286.v

The cross slide 80 is formed interiorly with a lug 288 (Figure 4) whichalso may be formed individually and secured to cross slide 80. A shortshaft 292 is journalled for rotation in lug 288 with its axis parallelto shaft 264. The travelling bracket 204 is threadedly engaged upon thethreaded rearward extremity of shaft 202. Oppositely disposedrectangular slideways 206 and-208 (206 being visible in Figure 5 and 208being visible in Figure 4) are also formed integrally with the frame ofcross slide 00 to serve as support for the bracket 204. A hardened plate300 is also attached to bracket 204, but on the upper side and facing inthe directionoppositethat of plate 286.

It will now be seen that, since cross-slide 90 has no movement in thedirection perpendicular to the grinding wheel axis, bracket 204 willremain stationary in that direction until adjusted differently byrotation of shaft 292. It will also be apparent that, since the usualpath of motion of the wheel slide |00 is perpendicular to the grindingwheel axis in order to bring the grinding wheel into contact with thework, bracket 216 will have motion in the said direction and that thedepth of penetration of the grinding wheel into the work will be limitedby the contact of plate 286 with stationary plate 300. When greater orless travel of wheel slide |00 is desired, as when a different size ofwork is operated upon, it is merely necessary to rotate shaft 202, thusmoving bracket 294 farther from or closer to the center of the work andthus correspondingly decreasing or increasing the travel of the wheelslide |00.

Forwardly of the lug 288, on the extremity of shaft 292 is iixedlymounted the bevel gear 302 which (Figure 5) meshes with'the bevel gear304 secured upon the end of the transversely directed shaft 306. Theseparable lug 308, which is attached to the frame of cross slide 90,supports the bearing bushings 3|0 through which shaft 306 is journalled,another bevel gear 3|2 being aflixed to the opposite end of shaft 306.

Gear 3|2 meshes with the bevel gear 3|4 (Fgure 4) which is affixed tothe longitudinal shaft 3|6, rotatably journalled in the lug 3|8, whichis also secured to the frame of cross slide 80. A universal joint 320 onthe opposite end of shaft 3|'6 is connected to the spline shaft 322. Acoupling 324 is telescoped over spline shaft 322and is rotated by meansof a handwheel 620 (Figure 10) as will be described later. It is obviousthat this rotation will be properly transmitted regardless of therelative lateral or transverse position of the taper grinding mechanismand thread grinding mechanism due to the provision of the universaljoint 320 and spline shaft 322.

Referring again to Figure 5, the wheel slide .|00 is provided,rearwardly adjacent the grinding wheel |62 with the male element 32s ofa `dovetail slide, upon which is mounted the crusher slide 328 forreciprocating motion in a direction parallel to that of the wheel slide|00. The upper surface of the crusher slide 328 is also formed with themale element 330 of a dovetail slide, upon which the crusher bracket 332is mounted for movement transversely of the crusher slide 328 andparallel to the grinding wheel axis.

A groove 334 longitudinally formed in the male element 330 providesspace to receive a lug 336 formed on the bottom surface of the crusherbracket 332. A threaded shaft 338 is supported land journalled forrotation by the bracket 340 to extend interiorly of groove 334 and toengage the interiorly threaded lug 336. The bracket 340 is secured tothe side of crusher slide 328 by the screws 342 (Figure 2). A knob 344is aiiixed to the outer end of the threaded shaft 338 for rotating thesame by hand and thereby causing the crusher bracket 332 to be adjustedtransversely of the wheel slide |00 and the crusher slide 328.

Crusher bracket 332 supports the crusher roller 346, preferably made ofhardened steel and used for renewing the desired contour of the grindingwheel |62. As is known in the art, the reverse of the desired contour isformed upon the roller 346 which is then forced radially against theperiphery of the grinding wheel to impress the correct form into therelatively softer abrasive material thereof, both crusher roller andgrinding wheel being rotated at slow identical surface speeds so thatthere is no relative surface movement therebetween.

The roller 346 is shown as driven through speed reducer 348 (Figure 1)and couplings 350 and 362, by motor 354. These latter units are allmounted on the sidewardly extending wing 356 of crusher slide 328. Anopening 358 is provided in. the side of extension |08 for the receptionof these parts (Figures 2. 4 and 5).

That part of the crusherY slide 328, which is rearwardly spaced frombracket 332, is provided Y with an integral upwardly extending bracket360 (Figure 4). Into a threaded opening 36| in bracket 360 is threadedthe piston rod 362 of the hydraulic cylinder 3'64, which is attached tothe forward wall of the wheel slide extension |10. Thereby a means isprovided for forcing the crusher slide 328 and roller 346 into contactwith the grinding wheel and for withdrawing the same therefrom. l

In Figure 4 it will be noted that crusher slide 328 is formed with alarge downward extension 366 which extends through openings in dovetail326 and web 258 into a position upwardly spaced from threaded shaft 264.A hardened block 368 is secured to the lower forward end of extension366.

The forward threaded portion 214 of the shaft 264 is passed through thenut section of a sliding bracket 310, which, like bracket 216, is seatedfor sliding movement in the slideways 282 and 284. A hardened block 312is attached to the rear top of bracket 310, in opposed relation to block368 on bracket 366. Thus, it will be seen that movement of crusher slide328 towards the grinding wheel is ended by the contact of blocks 368 and312.

A bevel gear 314 is flxed on the forward end.

of shaft 264 and forwardly of bearing lug 260. Gear 314 meshes withbevel gear 316 which is attached to the cross-shaft 318. 'Shaft 318extends through a bearing bushing 380 in-the vertical web 280 andthrough bearing bushing 382 in the aligned lug 384 (Figure 5). Two gearsare mounted upon the other end of shaft 318 beyond the bearing 382: thelarge bevel gear `386 which is mounted adjacent bearing 382 and thesmaller bevel gear 388 secured upon the extreme end of the shaft. f

Bevel gear 388 cooperates with bevel gear 390 (Figure 4) which isconnected by shaft 392, universal joint 394, and spline shaft 396 to thesplined coupling 398, which is connected to be rotated by a crusherhandwheel 486 in a manner to be later described.

Bevel gear 386 (Figure 5) engages the bevel pinion 400 which is securedto the lower end of the vertical shaft 402. Shaft 402 is journalledthrough the bearing bushing 404 fixed in the frame of wheel slide |00and extends upwardly to the connector 406 mountedon top of the wheelslide extension |08 where shaft 402 is attached to the flexible shaftindicated at 408 (Figure 4).

Spindle housing ||0 is provided with an upwardly extending bracket 4|0(Figures 3 and 4) which is formed with a spacious recess 4|2 on oneside. Secured to the top of bracket 4|0 is a gear box 4| 4 having acover 4|6. The extremity of fiexible shaft 408 is journalled through theside of gear box 4|4 and has a bevel pinion 4|8 attached thereto. Themating bevel gear 420 is mounted on the upper end of the vertical shafty 422 which is journalled through the bushing 424 fixed in the bottom ofgear box 4|4 and bracket 4|0.

Referring to Figures 3 and 4, the bracket 4|0 is provided, on one sidethereof, with the dovetail slideway 426 in which is mounted for verticalsliding movement the dresser base 428. A lug 438 projects from therearwardv surface of dresser base 428 into therecess 4 I 2. Shaft 422 isthreadedly engaged with lug 430 so that rotation of shaft 422l willcause dresser base 428 to move ver` tically. The outer surface ofdresser base 428 is provided with two laterally spaced arcuate T-slots432, 433. The bracket 434 is adjustably secured to 'dresser base 428 byscrews 4 36 and suitable T-clamps (not shown), engaging the slots 432and 433.

A forward extension 438 of bracket 434 is formed, on its downwardlyfacing surface, with adovetail slideway 440 in which is mounted forsliding movement the dresser slide 442. A diamond dressing tool 444 isheld in operative relation to grinding wheel |62 by the slide 442. Tothe opposite end of bracket 434 a hydraulic cylinder 445 is attachedhaving its piston rod secured to the rear end of dresser slide 442making it possible to reciprocate dressing tool 444.across the face ofgrinding wheel |62.

It is apparent then that the working position of the dressing tool 444is adjustable vertically for change in diameter of the grinding wheel bymeans of threaded shaft 422 and lug 430. The path of reciprocation ofdressing tool 444 is adjustable angularly by means of the arcuate T-slots 432. Thus, as shown in Figure 3, the threadforming grooves ofgrinding wheel 62 may b e beveled off by dressing tool 444 at any'desired angle with the axis of the wheel. This is useful to enable thewheel to reproduce on the work the gradual vanishing of the threads thatpresent pipe thread standards demand.

In Figures 2 and 3 will be seen the conventional type of wheel guard 446surrounding grinding wheel |62 and attachedby screws 448 to spindlehousing ||0. A similar cover 450 is provided to envelop the belts anddriving sheaves.

Taper grinding mechanism -mechanism for regulating this movement isidentical with that described previously as being associated with slidebase 48, and is controlled by hand wheel 455. Secured to slide base 452by screws 456 (Figure 12) is the stationary support member 458,corresponding to the cross slide i of the thread grinding mechanism.Since there is no necessity for movement of the taper grinding wheel -inan axial direction, support member 458 is thus stationarily mounted uponslidebase 452.

-Flat slideways 460 and 462 and V-shaped slide- Way 464 are provided onthe top of support member 458 to enable the taper grinding wheel slide466, mounted thereon, to reciprocate in a direction perpendicular to thegrinding wheel axis. This motion is powered and controlled by thehydraulic cylinder 468 mountedl on the rear wall of support member 458and having its piston rod 410 connected tol rearwardly extending bracket412 attached to the rear wall of wheel slide 466.

The taper grinding wheel 414 is supported by the spindle housing 416(Figure 1A) in the same manner that thread `grinding wheel |62 issupported by spindle housing ||0. In the present instance, however,spindle housing 416 is removably, but not adjustably, affixed to theforward wall of the upward side extension 418 of wheel slide 466, as bythe cap screws 419 (Figure 1A), since the necessity for helix angleadjustment is not present in the taper grinding mechanism.

The wheel slide 466 is also provided with the The crusher handwheel 486(Figure 10) transj mits motion through shaft 488 (Figure 11) to thebevel gear 490 (Figure 11). Gear 490 meshes with bevel gear 492 mountedupon shaft 494 which is connected to universal Joint 498, spline shaft498 and splined coupling 898. Thus, through the above describedconnection and its continuation in the thread grinding mechanism,crusher handwheel 488 serves to rotate directly the shaft 264 (Figure 4)which moves the brackets 216 and 810 in opposite directions.

Referring to Figures 11 and 12, support member L458 is provided,interiorly thereof, with longitudinally directed, rectangular slideways500 (Figure 12) and 502 (Figure 11) in which bracket 504 is mounted. Ashaft 506 is journalled for rotation in bushing 501 in the detachablelug 508 which is secured to the frame of support member 458. One end ofshaft 506 is threadedly engagedflg in the travelling bracket 504 whilethe opposite end has secured thereto the bevel gear 5|0.

Gear 5|0 meshes with two bevel gears 5|2 and 5|4 (Figure 12) .f Gear 5I2 is mounted upon shaft 5|8 which is journalled through bushing 5|8 inthe side wall of support member 458. A handwheel 520 is secured to theouter end of shaft 5|6. 'I'hus rotation of shaft 506 is produced and thesame rotational movement is transmitted through gears 5I2, 5|0 and 5|4to a coaxial shaft 5|1 to which gear 5| 4 is attached. Shaft 5|1 isjournalled through the bearing bushings 52| in the lug 5|9 secured tothe frame ofsupport member. 458. The opposite end of shaft 5|1 hasmounted thereon the bevel gear 522.

Gear 522 meshes with bevel gear 524 (Figure .11) which is secured uponshaft 526 journalled through lug 528 attached to the frame of supportmember 458. Shaft 526 is connected by universal joint 580 and splineshaft 532 to the splined coupling 324 for transmission of rotarymovement through the mechanism previously described vto shaft 292(Figure 4) in the thread v grinding mechanism. Thus it is apparent thathandwheel 520 is employed to adjust brackets 294 and 504 simultaneously.

Anotherhandwheel 534 mounted upon a transverse shaftv 536 whichl isjournalled for ro'- tation in the bearing bushing 538 set in the sidewall of wheel slide 466. Shaft 588 extends through wheel slide 466 andhas its opposite end journalled in bushing 540 fixed in the oppositewall of said wheel slide 466. Interiorly adjacent bushing 540 a pinion542 is mounted'on shaft 586 for engagement with an idler spur gear 544.A stud 546 which supports gear 544 is journalled `through the side wallof'wheel slide 466 and is held in correct axial position by the nut 548engaged on the outer extremity thereof. Gear 544 meshes with pinion 550to transmit rotary motion to shaft 552 on which pinion 550 is.

562 (Figure 11) secured on the longitudinal threaded shaft 564.

Shaft 564 has its forward end journalled for rotation in bushing 566 xedin lug 568 which is secured to the frame of wheel slide 466. Extendingrearwardly therefrom, shaft 564, terminates in a guide portion 510 whichpasses through an opening 51| in lug 512 formed integrally with wheelslide 466. Between portion 510 and gear 562, shaft 564 has .two threadedportions 514 and 516, the threads of which are of opposite hands. Therearward threaded portion 516 engages the threaded -bore of slidingbracket 518 which is mounted for longitudinal sliding movement inremainder being supported by being threaded through brackets 518 and588.

A hardened plate 584 is carried by bracket 518 'at its forward loweredge to engage a similar plate 586 carried at the top of bracket 504.Thus, the relative positions of brackets 504 and 518 determine theamount of infeed applied to grindingwheel 414, an amount which may bemade greater, as when a smaller diameter work piece is beingoperated'upon, by turning handwheel 520 to move bracket 504 to the left(Figure 11) and vice versa. y

In Figures 11 and 12 it is seen that the whe slide 466 is provided witha platform 590 upon which is mounted the male element 592 of a dovetailslide. A dresser slide 594 is mounted on male element 592 forreciprocation in a path perpendicular to the axis of grinding' wheel414. A plate 596 is mounted on the forward end of dresser slide 594 andispositioned by the key 591. The male element 598 of a dovetail slide inthe transverse direction is formed on plate 596. A transverse slide 600is slidably mounted on male element 598.

A template 602 is secured by screws 604 (Figure 1A) to plate 596. Atemplate follower 606 is secured by screw 608 to the side of asubstantially cylindrical member 6|0 journalled longitudinally throughtransverse slide 600. A diamond tool 6|2 is supported by member 6|0 andmaintained thereby in correct position for dress` l ing grinding wheel414. A hollow member 6|4' is threadedly engaged in slide 600 inalignment with member 6|0 and contains a compression spring 6I6l whichpresses against member 6I0 and thereby maintains follower 606 in contactwith template 602.

From Figures 1A and 10 it is seen that a hy- "draulic cylinder 6|8 ismounted upon a bracket with dresser slide 594 to threadedly engage thepiston rod 626 (Figure 11) of the hydraulic cylinder 628. A nut 630locks piston rod 626 in desired axial position. Cylinder 628 is securedto the forward wall of extension 480 of wheel slide 466 and is effectiveto move diamond tool 6|2 into a position where it is ready to traversethe grinding wheel 414. The cylinder 628 is not essential to properoperation of this wheel dressing operation vbut may be used, if desired,to withdraw the diamond tool 6|2 from proximity to grinding wheel 414for replacement or other reasons and for returning said tool tooperative position without disturbing the previously adjustedrelationship between dressing tool position and grinding wheel diameter.

. In Figure 11 it will be noted that dresser slide 594 is provided witha downwardly extending 13 portion 632, to the lower forward extremity ofwhich is attached a hard plate 634 in `opposed relation to a similarplate 636 in the upper forward corner of bracket 586. Thus the forwardmotion of dresser slide 564 and, consequently, the amount of penetrationof diamond tool 612 into grinding wheel 414 is limited bythe position ofbracket 586. This position, as before de- (scribed, is adjustable byrotation of handwheel Auxiliary mechanisms Figures 1 and 1A show thehousing 36 located opposite the head stock 36 and partly between thetaper and thread grinding mechanisms. 'I'his housing 36 and its contentsare more fully shown in Figures 14 to 17 inclusive.

Figure 15 shows a hydraulic cylinder 638 mounted in the upward extension846 of housing 36. The piston rod 642 oi' cylinder 636 is threadedlyengaged in the rearward end of the rod 644. A lock nut 646 is providedfor the purpose o1' maintaining this adjustable connection in ad-Justment, and a key 648 prevents rotation of rod 644 in the opening inextension 646 of housing 36`through which said rod is slidablyjournailed.

Figures 1 and 1A show that rod 644 extends from housing 36 toward thefront chuck 36 in alignment with the center thereof. A stop bar 556 issecured to rod 644 for the purpose of engaging the end of the pipe 45 tobe machined and lplacing said pipe in proper position between thegrinding wheels as will be described. A further i extension 652 (Figure1B) of rod 644 carries a cylindrical sealing member 554 inside the pipeWhile it is being operated upon to prevent escape of coolant, etc.through the pipe.

Rod 544 is provided, along its lower surface, with the rack teeth 656. Agear 658 is fixed upon shaft 666 which is journalled for rotation inopposite walls of extension 646 of housing 36. Gear 558 acts to transmitlongitudinal motion from rack teeth 656 to similarrack teeth 662 formedalong the upper surface of a switch actuator rod 664 which is journalledfor reciprocative longitudinal movement in a bore 655 in the extension646. `'A tube 666 having its outeri end closed is threaded into theouter end of the bore 665 to provide suiiicient room for the travel ofrod 664 and at the same time prevent the entry of foreign matter intothe mechanism.

It will be seen that the movement of rods 644 and 664 will be controlledby thecylinder 636 and that said rods will always move in oppositedirections. As will be explained later in connection .with Figure 18A,therod 644 carries a pair of dogs which operate a pair of limit switchesLS41 and LS46.

A rotatable shaft 616 (Figures 1B and 15) extends from the headstock 36,where it is connected by means of suitable gearing (not shown) to thedriving motor 42, to the housing 36, where it is journalled in bushing612 in the forward wall thereof (Figure 15). A bracket 614 is formedintegral with the frame of housing 36 and supports a bushing 616 inwhich shaft 616 is also journalled. A lock nut 618, threaded upon theend of shaft 616, retains the same in correct axial position.

In the space between bushings 612 and 616, a spur gear 586 is iixedlymounted on shaft 616. On one side, gear 666 drives the gears 682 and 584(Figure 14). the latter of which is suitably connected to a timingmechanism 685 (Figure 18) whose purpose is to synchronize the operationsof all parts of the machine. On the other side, gear 686 drives gear 666(Figures 14 and 16) which is mounted on a stud 661 journalled inbushings 668 and 666 (Figure 16) in a housing 36 and bracket 614respectively. The emerged end 662 of stud 661 and allocknut 664 preventaxial movement of said stud.

Gear 686 drives gear 666 (Figures l1.4 and 18) xed on shaft 566. 1 Therear wall of housing 66 is provided with a large recess 166 to receivethe leadscrew change gears of the machine. A cover 162 is removablysecured over recess 166. The bottom wall 164 of recess 166 is bored toreceive the bearing bushing 166. Shaft 666 is ljournalled for rotationin bushings 166 and 166, the latter of which is secured in the forwardwall of housing 36.

Also pivoted about bushing 166 is a gear. quadrant 116, exteriorly ofwhich gear 112 is flxedly mounted upon shaft 666. A nut 114 is providedto retain shaft 666 in axial position. Gear 112 drives gear 116 which isrotatably mounted upon a bushing 116 supported by stud 126. Stud 126passesthrough a suitable opening in gear quadrant 116 and is held inplace axially by its own enlarged head 122 and nut 124 which is clampedagainst the bushing 116.

Gear quadrant 1 I6 is secured in adjusted angul lar position about shaft668 by the nut 126 and washer 126 which are received upon stud 136mounted in an opening through wall 164 of recess 166. Stud 136 passesthorugh the arcuate' slot 132 (Figure 14) in quadrant 116, whichprovides for its adjustment to any of a variety of angular positionsaccording to the gear ratio selected. Another slot 134, having one endopen, is provided in quadrant 116 for the insertion of a stud carryinganother idler gear for the purpose of reversing the direction of thefinal driven gear and thus, as will be more evident later, cutting aleft hand thread.

Gear 116 drives the leadscrew gear 136 (Fig-- ures 14 and 17) which issecured upon the rearward extremity of the leadscrew 136 by the nut moveaxially with respect to them under overload conditions, as will beapparent. The bushing 146 is employed as a spacing member betweenbearings 142, 142. The caps 148 and 156 are provided at opposite ends ofboss 144 surrounding leadscrew 138 to retain bearings 142, 142 in saidboss, the caps being affixed to the boss in any suitable manner.

The threaded portion 152 of leadscrew 136 is engaged inthe leadscrew nut154 of cylindrical outline and journalled for longitudinal movement inthe boss 156 in the forward wall of housing 35. A key 156 preventsrotation of leadscrew nut 154. A sealing member 166 surrounds leadscrewnut 154 on the outer side of boss 156. Exteriorly of housing 36,leadscrew nut 154 is formed with an integral arm 162 and pin 164 whichpin is positioned vertically across the axis of leadscrew nut 154. Abearing bushing 166 surrounds pin 164 and has journalled thereon one endof a link 166. A locknut 116 isthreadedly engaged on the end of pin 154to retain link 166 thereon.

As seen in Figures 1 and 3, link 166 has its other end journalled uponbushing 112 which is fitted over the vertical pin 114. Pin 114 is fixedin the extension 115 of cross slide 66. Thus, itis apparent thatrotation of the above-described lead-

